ReentrancyGuard.h - mozsearch

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/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/* Small helper class for asserting uses of a class are non-reentrant. */

#ifndef mozilla_ReentrancyGuard_h

#define mozilla_ReentrancyGuard_h

#include "mozilla/Attributes.h"

#ifdef DEBUG

#  include "mozilla/Assertions.h"

#endif

namespace mozilla {

/* Useful for implementing containers that assert non-reentrancy */

class MOZ_RAII ReentrancyGuard {

#ifdef DEBUG

  bool& mEntered;

#endif

 public:

  template <class T>

#ifdef DEBUG

  explicit ReentrancyGuard(T& aObj)

      : mEntered(aObj.mEntered)

#else

  explicit ReentrancyGuard(T&)

#endif

#ifdef DEBUG

    MOZ_ASSERT(!mEntered);

    mEntered = true;

#endif

  ~ReentrancyGuard() {

#ifdef DEBUG

    mEntered = false;

#endif

 private:

  ReentrancyGuard(const ReentrancyGuard&) = delete;

  void operator=(const ReentrancyGuard&) = delete;

};

}  // namespace mozilla

#endif /* mozilla_ReentrancyGuard_h */